<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
  <script src="../react18/prop-types.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">
    /* 
      porps是用来做父子组件通信的
        - 在父组件中使用子组件的时候,可以给子组件添加属性
        - 在子组件中组件实例的props属性上,就能拿到这个属性和值
    
    */
    /* class Parent extends React.Component{
      state = {
        car:"八手奥拓"
      }
      render(){
        const {car} = this.state;
        return (
          <div>
            <h1>我是父组件</h1>
            <p>我开的车是{car}</p>  
            <button onClick={this.changeCarHandle}>股票涨停了,换一辆车</button>
            <hr/>
            <Child a={1} car={car}/>
          </div>
        )
      }

      changeCarHandle = () => {
        this.setState({car:"奥迪RS7"})
      }
    }

    function Child(props){
      const {car} = props;
      return (
          <p>我是儿子组件,我开我老子的车{car}</p>
        )
    }

    //给Child接受的props进行类型限制
    Child.propTypes = {
      a:PropTypes.number.isRequired,
      car:PropTypes.string
    }


    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<Parent/>) */



    /* class Parent extends React.Component{
      state = {
        car: "奥迪A6L"
      }

      render(){
        const {car} = this.state;
        return (
          <div>
            <h1>我是父组件</h1>
            <p>我开的车是{car}</p>
            <Child car = {car} a = {123} />
          </div>
        )
      }

    }

    function Child(props){
      const {car , a} = props
      return (
        <div>
          <p>我是儿子组件,我开我老子的车{car}</p>
          <p>a:{a}</p>
        </div>
      )
    }

    //给子类接收的props类型做限制
    Child.propTypes = {
      car: PropTypes.strting,
      a: PropTypes.number.isRequired
    }

    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<Parent/>) */



    class Parent extends React.Component{
      state = {
        car: "奥迪A6L"
      }

      render(){
        const {car} = this.state;
        return (
          <div>
            <h1>我是父组件</h1>
            <p>我开的车是{car}</p>
            <button onClick = {this.changeCar}>换一辆车</button>
            <Child car = {car} a = {123}/>
          </div>
        )
      }

      changeCar = () => {
        this.setState({car:"奥迪RS7"})
      }

    }

    function Child(props){
      const {car,a} = props
      return (
        <div>
          <p>我是儿子组件,我开我老子的车{car}</p>
          <p>a:{a}</p>
        </div>
      )
    }


    Child.propTypes = {
      car: PropTypes.strting,
      a: PropTypes.number.isRequired
    }

    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<Parent/>)


  </script>
</body>

</html>